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Biodegradable Waste to Biogas: Renewable Energy Option for the Kingdom of Saudi Arabia

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Biodegradable Waste to Biogas: Renewable Energy Option for the Kingdom of Saudi Arabia View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Directory of Open Access Journals International Journal of Innovation and Applied Studies ISSN 2028-9324 Vol. 4 No. 1 Sep. 2013, pp. 101-113 © 2013 Innovative Space of Scientific Research Journals http://www.issr-journals.org/ijias/ Biodegradable waste to biogas: Renewable energy option for the Kingdom of Saudi Arabia Muhammad Sadiq Munfath Khan1 and Zakariya Kaneesamkandi2 1Sustainable Energy Technology (SET) Department, College of Engineering, King Saud University, PO Box 800, Riyadh, 11421, Kingdom of Saudi Arabia 2Mechanical Engineering Department College of Engineering, King Saud University, PO Box 800, Riyadh, 11421, Kingdom of Saudi Arabia Copyright © 2013 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT: Energy recovery from waste is not a new field of study, but its implementation continues to be a challenge in some Arab countries. Although there is abundance of useful waste in the urban markets, practices aiming at waste to energy conversion are still negligible. In the kingdom of Saudi Arabia, so-called green markets are abundant with renewable energy potential, but the practical implementation of this potential is missing. Therefore the objective of this paper is the evaluation of waste generation in KSA for the energy recovery purpose, and to show that the conversion of green waste into biofuel is not only environmentally friendly but also financially rewarding. Since the result illustrate that the major portion of the waste generated is organic waste, anaerobic digestion is proposed waste to energy technology because of its feasibility for biodegradation of moist organic wastes into biogas. Diversion of waste into biogas and bio-fertilizer will ensure that it is treated in such a way that it becomes a useful product instead of harmful one. Furthermore as the policy makers and planners in renewable energy sector have intended for kingdom of Saudi Arabia to be “kingdom of sustainable energy” as well, hence they are needed to give special attention toward the largest Saudi Arabia’s green market and should invest more to implement this plan. KEYWORDS: Waste management, Biodegradable waste, Renewable energy, Biogas, Anaerobic digestion. 1 INTRODUCTION Arab countries are presently faced with problems such as increasing urbanization and demands for more food and shelter to sustain a standard life pattern. Organic waste primarily composed of food waste, especially in the major cities of these countries which are facing with solid waste problems because of an increasing population and urbanization. Solid waste mismanagement is one of the main reasons for environmental deprivation. [1]. Statistical data from the International Energy Agency [2] shows that conventional energy resources like oil continue to be the most important sources of energy, accounting for approximately 80% of the total primary energy supply (TPES); oil is followed by coal and gas as sources of energy. The second-most important contributor is combustible renewable energy (CRE), which accounts for 10% of the world’s TPES share. CRE, or traditional biomass energy, constitutes 80% of the total renewable energy consumed mainly in developing countries. King Abdullah research centre for atomic and renewable energy (K.A.CARE) in Saudi Arabia is planning to get 16 GW from PV, 25 GW from ,17 GW nuclear,9 GW from wind, 3 GW from waste to energy and 1GW from geothermal by the year 2032 [3]. With fossil energy sources eventually dwindling and becoming increasingly more expensive, waste-to- energy routes are gaining future attraction [4]. Cities account for approximately two-thirds of the world’s primary energy consumption and 71% of global fossil fuel related direct greenhouse gas emissions [5]. To ensure that cities maintain their vital social and economic functions, there is a need to develop urban energy systems that are more efficient and emit less Corresponding Author: Muhammad Sadiq Munfath Khan ([email protected]) 101 Biodegradable waste to biogas: Renewable energy option for the Kingdom of Saudi Arabia carbon dioxide. One option is to switch from fossil fuels to renewable energy sources such as wind, solar or biomass. The average greenhouse gas emissions per capita in the WTET are much lower, representing 80% - 87% reductions over the gas boiler case [6]. Biomass is an interesting renewable energy source for several reasons. The main reason is that bio-energy can contribute to sustainable development [7]. The fruit and vegetable markets produce large amounts of waste each year, and the disposal of these wastes is costly, both financially and environmentally. Studies [5–11] have revealed that by utilizing the physiochemical properties of these wastes, they can be upgraded to products of higher value that have a place in the market. Vegetables, fruits, and flowers are sold in large quantities in markets, and wastes thereof are disposed of along with municipal solid wastes (MSW) in landfills or dump-sites; this creates a breeding ground for vector, pest, odor, and greenhouse gas (GHG) emissions into the atmosphere. Renewable waste materials from agriculture, industries, and domestic sources are converted to useful energy forms such as bio-hydrogen, biogas, and bio-alcohols through waste-to-energy routes for global sustainable growth. Biomass energy can play an important role in reducing green house gas emissions, the use of biomass for energy offsets fossil fuel greenhouse gas emissions. At present, biomass is mainly used as a traditional fuel, contributing to about 38±10 EJY1, modern biomass to about 7 EJY-1 [8]. Many energy scenarios suggest large shares of biomass in the future energy system .The availability of this biomass are not always separately analyzed. Furthermore, large- scale utilization will have large consequences for land demand and biomass infrastructure, which should be assessed. Many studies have been undertaken to assess the future biomass energy potential [9- 12]. To produce renewable energy from green waste, there is great potential of waste in KSA. If the generated waste is properly utilized, it could add greatly to the energy needs of the kingdom. Therefore, the aim of this study is a preliminary but yet challenging step to conduct research on the green markets in KSA. The main purpose of this study is to review the prospective of producing biogas from the waste generated locally, and in order to point up that the conversion of waste-to energy is environmentally friendly. The study is divided into five section: the introduction; KSA’s biomass energy potential, a case study of waste generation and management in KSA, a brief comparison of waste-to-energy technologies and selection of suitable one based on waste composition, cost analysis and yield prediction of biogas, and finally the concluding remarks. The study provides important information in order to enhance the development of this industry in KSA in the future. 2 BIOMASS ENERGY Biomass energy is a renewable energy resource derived from the carbonaceous waste of various human and natural activities. It is derived from numerous sources, including the by-products from the timber industry, agricultural crops, raw material from the forest, and major parts of household waste. Biomass does not add carbon dioxide to the atmosphere as it absorbs the same amount of carbon in growing as it releases when consumed as a fuel. Biomass is the most important fuel worldwide after coal, oil and natural gas. Bio-energy, in the form of biogas, which is derived from biomass, is expected to become one of the key energy resources for global sustainable development. Biomass can be converted into three types of useful product namely, electrical energy, transport fuels and chemical feed stock. 2.1 BIOMASS RESOURCES IN KSA Huge amount of waste is generated in KSA mainly in the form Municipal Solid Waste (MSW), Industrial Organic waste, and sewage. It has been estimated that the total biomass energy potential of KSA is 3.0 (mtoe) [13] and it stands fourth in the Arab world after Morocco, Egypt and Sudan, Fig:1. Solid waste generation in Arab countries is increasing rapidly. Fig.2 shows [14] the solid waste generation comparison of some industrialized and emerging Arab countries; it is obvious that solid waste generation in KSA is much higher comparatively. This could be due to tourism to the Islam’s holiest places in kingdom, rapid urbanization, construction, and/or population density. Thus for, KSA’s per capita generation of waste per day (1.75Kg) is superior compared to other countries in the region that have less than one, Fig. 2. ISSN : 2028-9324 Vol. 4 No. 1, Sep. 2013 102 Muhammad Sadiq Munfath Khan and Zakariya Kaneesamkandi 5 4,5 4 3,5 3 2,5 2 1,5 mtoe/year 1 0,5 0 Fig. 1. Figure 1: Biomass energy potential (mtoe) 1,75 1,5 1,25 1 0,75 Kg/Day 0,5 0,25 0 Fig. 2. Solid waste generation rate per capita As per indicative levelized cost of renewable energy sources against gas-fired entrants in KSA [15] it is evident from figure:3 that the cost of energy produced from biomass is comparable to that of energy obtained from the other available resource (Solar thermal & PV, Tidal energy) in the kingdom, and if the biomass energy available is effectively utilized then it can provide energy at about $101/MWh which is 65.65% and 57.23% cheaper than solar and tidal energy respectively. ISSN : 2028-9324 Vol. 4 No. 1, Sep. 2013 103 Biodegradable waste to biogas: Renewable energy option for the Kingdom of Saudi Arabia 1200 1080 970 1000 800 800 600 380 400 Saudi Riyals/MWh Saudi 200 200 40 20 0 solar PV Tidal solar Biomass wind SCGT CCGT thermal Fig.
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